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參數(shù)資料
| 型號： | ML4771 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | High Current Boost Regulator(高電流升壓穩(wěn)壓器) |
| 中文描述： | 高電流升壓穩(wěn)壓器（高電流升壓穩(wěn)壓器） |
| 文件頁數(shù)： | 1/8頁 |
| 文件大?。?/td> | 265K |
| 代理商： | ML4771 |
July 2000
ML4771
*
High Current Boost Regulator
GENERAL DESCRIPTION
The ML4771 is a continuous conduction boost regulator
designed for DC to DC conversion in multiple cell battery
powered systems. Continuous conduction allows the
regulator to maximize output current for a given inductor.
The maximum switching frequency can exceed 200kHz,
allowing the use of small, low cost inductors. The ML4771
is capable of start-up with input voltages as low as 1.8V,
and the output voltage can be set anywhere between 3.0V
and 5.5V by an external resistor divider connected to the
SENSE pin.
An integrated synchronous rectifier eliminates the need
for an external Schottky diode and provides a lower
forward voltage drop, resulting in higher conversion
efficiency. In addition, low quiescent battery current and
variable frequency operation result in high efficiency even
at light loads. The ML4771 requires a minimum number of
external components to build a very small regulator circuit
capable of achieving conversion efficiencies exceeding
85%.
FEATURES
I
Guaranteed full load start-up and operation at
1.8V input
I
Continuous conduction mode for high output current
I
Very low supply current (20
μ
A output referenced) for
micropower operation
I
Pulse Frequency Modulation and Internal Synchronous
Rectification for high efficiency
I
Maximum switching frequency > 200kHz
I
Minimum external components
I
Low ON resistance internal switching FETs
I
Adjustable output voltage (3.0V to 5.5V)
BLOCK DIAGRAM
VL2
5
VOUT
SENSE
R1
R2
COUT
VOUT
*CFB
6
VIN
2
GND
VBAT
*CIN
VL1
L1
1
8
PWR GND
3
BOOST
CONTROL
4
(* Indicates Part is End Of Life as of July 1, 2000)
REV. 1.0 10/10/2000
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ML4771 / 4871 WAF UP | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| ML4771/ML4871CS UP WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| ML4771CS | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:High Current Boost Regulator |
| ML4771ES | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:High Current Boost Regulator |
| ML4775 | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Adjustable Output Low Voltage Boost Regulator with Shutdown |
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